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      var $image = $(this);
      var imageCaption = $image.attr('alt');
      var $imageWrapLink = $image.parent('a');
      if ($imageWrapLink.length < 1) {
        var src = this.getAttribute('src');
        var idx = src.lastIndexOf('?');
        if (idx != -1) {
          src = src.substring(0, idx);
        }
        $imageWrapLink = $image.wrap('<a href="' + src + '"></a>').parent('a');
      }
      $imageWrapLink.attr('data-fancybox', 'images');
      if (imageCaption) {
        $imageWrapLink.attr('data-caption', imageCaption);
      }
    });
    $().fancybox({
      selector: '[data-fancybox="images"]',
      hash: false,
      loop: false,
    });
  });
  </script>





<div id="go-top"></div>
<style type="text/css">
#go-top {
 width:40px;height:36px;
 background-color:#777;
 position:relative;
 border-radius:2px;
 position:fixed;right:10px;bottom:60px;
 cursor:pointer;display:none;
}
#go-top:after {
 content:" ";
 position:absolute;left:14px;top:14px;
 border-top:2px solid #fff;border-right:2px solid #fff;
 width:12px;height:12px;
 transform:rotate(-45deg);
}
#go-top:hover {
 background-color:#333;
}
</style>
<script>
$(function () {
  var top=$("#go-top");
  $(window).scroll(function () {
    ($(window).scrollTop() > 300) ? top.show(300) : top.hide(200);
    $("#go-top").click(function () {
      $('body,html').animate({scrollTop:0});
      return false();
    })
  });
});
</script>  
</body>
</html>